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2
votes
2answers
59 views

Slightly bloated LiPo; still save?

I am using lithium polymer batteries without much internal protection, as is common in RC planes and such (weight constraints). I have noticed that some of the older ones feel like they built up some ...
0
votes
1answer
43 views

How does charge/discharge current increase battery temperature?

I already know that charging or discharging a battery causes it to heat up, and that increase in heat is proportional to the current. But what physical process is behind this? My back-of-the-envelope ...
0
votes
1answer
45 views

Understanding Li-ion Battery(ICR18650-26H)

I trying to use a Li-ion Battery in my project. ICR18650-26H is suitable for my project(GPS data logger) I think. I am having hard time understanding one particular parameter in the specification ...
1
vote
2answers
118 views

Battery discharge current

What is the meaning of standard discharge current mentioned on the datasheet of lithium batteries. Does it represent the maximum current load can take or it represent the instantaneous current battery ...
0
votes
3answers
103 views

Car battery capacity in colder countries

The capacity of the battery is affected when the temperature drops, particularly Lead-acid batteries. So how in cold countries this situation is solved. In this PDF about automotive batteries at low ...
0
votes
1answer
33 views

Using other Lithium based batteries

My question pertains to different types of the Li-ion batteries currently available. http://investingnews.com/daily/resource-investing/energy-investing/lithium-investing/6-types-of-lithium-ion-...
3
votes
1answer
126 views

Why do batteries have a short lifetime despite having no moving parts?

Chemical batteries do not seem to have any moving parts, but seem to have a rather short lifetime anyway. Why is this? The only reason I can think of is electrolyte leaking, but I have never noticed a ...
1
vote
1answer
92 views

Li-Ion pulse discharge to improve output characteristics

There are many scientific studies done on pulse charging of Lithium-Ion batteries. However, I have found nearly none on pulse-discharging those. Here is probably one of the few-ones. This study ...
1
vote
1answer
52 views

Old 9v battery - Strange Behavior

The battery in my garage door remote finally quit. Before replacing it, I measured the voltage with a digital multimeter and was surprised to find it reading 9.70v, quite a bit higher than the ...
0
votes
3answers
128 views

Charging a battery with float voltage

Is it possible to charge a lead acid battery(12V) with float voltage(13.6V) instead of charge voltage(14.4V)?I understand it will take lot of time to charge if we charge with float voltage.
2
votes
1answer
49 views

Does the positive pole of an an electrolytic capacitor act as a cathode when discharging?

As far as I know, the anode of a polarized device is defined as the location where the oxidation occurs. For a galvanic cell, this means that it corresponds to the negative pole, while for an ...
-2
votes
1answer
106 views

Equal charging of new and old battery [closed]

I am using four "12volt" batteries of 150 amp hour each, for a 24 volt solar backup system of ouyback things since four years. Now i add 4 new batteries of same capacity to increase the backup time ...
0
votes
2answers
164 views

How could a rechargeable battery charge itself without an external source?

While I was working on my graduation project I had to charge a rechargeable battery then discharge it and so on.I was shocked when the battery charged itself without any other external sources for ...
1
vote
1answer
68 views

at what temperature does it become expeditious to use a lithium battery's charge to heat itself?

battery capacity diminishes the colder the battery gets. Is there a point where it's worth using the battery's energy to warm it up, increasing capacity? If so, where's the break-even point? If not, ...
0
votes
2answers
99 views

Are there any battery chemistries that can be fabricated at home?

My question is simple. How hard it would be to fabricate a Battery of customized shape say of 30cm x 30 cm x 0.5 cm that can be fabricated by DIY without requiring any specialized/ hazardous chemicals ...
0
votes
1answer
41 views

NiMH 1.2V 1/3 AA 280 mAh is it possible the claim made for size and capacity?

I am browsing some batteries to use for a wearable project.Initially I wanted to go with Lipos but upon stumbling upon this link I am amazed at NiMH and the variety of size, shape and battery capacity....
0
votes
2answers
251 views

avoid Li-Ion batteries explosion

As a student group project, we are going to use Li-Ion batteries to test our charging and balancing circuit. These batteries at risk of explosion. How should we avoid that danger? Is there any ...
2
votes
1answer
998 views

Charging NiMH batteries with 1W solar panel, charge controller needed?

I want to know if a charge controller would still be needed despite the solar panel never outputting more than C/10 of current to the battery. This is a follow-up about my question here. The solar ...
2
votes
2answers
852 views

what is the Outer casing of alkaline battery made of?

what is the outer casing of a typical small 9v alkaline battery made of? Is it conductive?
0
votes
1answer
74 views

custom battery for CO2 generation

I want to design a small, cheap device that generates CO2 but I also want to capture the voltage to drive an LED. Any advice about which half-cell reaction I should use (oxalate?) or battery design. I ...
0
votes
1answer
122 views

Eneloop rechargable batteries for mouse? [closed]

I have a Apple Mighty Mouse, and I want to use rechargeable batteries, but I read somewhere on such a device I should only use Eneloop rechargeable batteries as they hold a charge when the device is ...
3
votes
2answers
131 views

How does a laptop maintain battery at full?

I know how a laptop battery becomes charged, however, I am not so sure how the power is maintained when when the battery has been charged to the maximum. I am unsure whether the laptop would switch ...
0
votes
3answers
2k views

Best kind of battery for electric motorcycle?

Sorry if this question doesnt belong here, I am new and learning. I want to try and build a DIY electric motorcycle, but am having issues finding the right batteries to use. I've tried searching for ...
1
vote
1answer
72 views

What is the purpose/benefit of using different electrodes in the same circuit?

I've studied various science fields in depth for years it seems, and I have never been able to get an understanding of this fundamental idea. I understand the purpose of different types of electrodes ...
0
votes
1answer
106 views

Understanding Battery rating

I need clarification regarding the rating of the battery shown in the below figure. I know battery ratings are given in Ah(Ampere-hour), but here it is given A/s. The picture is from "Linden's ...
0
votes
3answers
670 views

Difference in self discharge rate between Lithium iron phosphate battery vs Lithium Polymer Battery

What is the difference in self discharge rate between lithium iron phosphate battery and lithium polymer battery? I have a remote application in which the self discharge rate matters a lot.
1
vote
1answer
180 views

Lead Acid max discharge rate?

I am building a flashlight using a large(ish) 35W HID headlamp from a car, and I'm having troubles choosing a good battery technology. The inverter draws about 3.5A - 4A at 12V, tested on a large ...
0
votes
1answer
205 views

Is it OK to trickle charge a disposable battery [duplicate]

So I am playing around with designing a UPS when another question hit me. If I have a source feeding a small amount of current into a non-rechargeable battery is this OK. By OK, I mean is this ...
-1
votes
3answers
235 views

Sanyo battery: what 430MH stands for?

I have a SANYO NI-MH battery from my Oral-B toothbrush. I reads 430MH. Now I'm curious what does 430MH stand for? Im thinking its probably nickel–metal hydride if ...
2
votes
1answer
123 views

Is there an easy way to protect a PCB from leaked electrolyte?

I've come across a LED flashlight that has rather curious design. The flashlight is rather powerful - it can notably heat up in "turbo" mode and so the driver definitely deals with some serious ...
2
votes
2answers
196 views

Alkaline cells vs. LED flashlight

I have (had, actually) an El Cheapo pocket LED flashlight powered by 3 AAA cells. It was shipped with very low quality "salt" cells (regular, low weight - someone please suggest a proper English name ...
0
votes
2answers
923 views

is a higher voltage battery a more efficient energy deliverer than a lower voltage battery?

a DC electric motor moving a car. will it experience the same torque with current provided from a 4V battery with a capacity of 1000 Ah as with current provided from a 400V battery with a capacity of ...
0
votes
1answer
292 views

relationship between battery voltage and discharge rate

I guess my question roots from me not understanding what a load represents to the battery. Is a 4V battery able to discharge at a higher rate (C rate) than a 2V battery? Or does it completely depend ...
1
vote
2answers
252 views

Best value Lithium ion/polymer cells/batteries

I've built a sound reactive, android controlled, wearable RGB LED matrix/suit which I'm currently powering with a rather heavy 12V 3Ah SLA battery. I'm looking to switch to lithium or ni-mh packs and ...
4
votes
1answer
268 views

The voltage of capacitor across battery never reaches battery voltage

I made some homemade vinegar batteries. The voltage of each cell was measured around 0.45V. I have 18 of them in series and I measured around 6.5V for the whole chain. Since the vinegar batteries ...
7
votes
2answers
1k views

New alkaline batteries with 10-year shelf life—what's changed?

I'm finding that some new alkaline batteries, such as the new Duracell Duralock and Energizer Power Seal batteries, have a shelf life of 10 years. Most other alkaline batteries have a shelf life of 7 ...
4
votes
2answers
900 views

How fast may I trickle charge a full LSD NiMH battery?

I've bought two packages of low-self-discharge nickel-metal hydride AA batteries, each made by a different well-known battery manufacturer. Sadly, the datasheets aren't very detailed: • One ...
5
votes
1answer
2k views

Lithium-ion rechargeable battery, shelf life

For Lithium-ion rechargeable batteries, that have never been charged, or been charged like 2-3 times at most, some 2-3 years back, and having since-then been in packaged condition, what should I ...
3
votes
1answer
119 views

What makes primary batteries leak on very deep discharge?

From my experience, if a primary (alkaline or zink) battery is left in a device with very low consumption (like a remote control, or a quartz watch) then at some point all the energy is drained and ...
2
votes
1answer
202 views

Can a lead-acid battery charger be used for “Gel” type?

I have a PB-600-24 lead acid battery charger. Can I use it for the battery type that has an image as below? 4 of the batteries are in series.
6
votes
1answer
256 views

If I turn a AA around will it drain or damage electronics?

I have an Apple Bluetooth keyboard. The thing turns on all the time when I put it in my backpack. This is bad because it blocks the soft keyboard on my phone. It runs on 2 AA batteries. Lately, I ...
5
votes
3answers
906 views

Why does connecting batteries in series result in doubled current sourcing while shorting?

I have Duracell Ultra Power AAA batteries, current draw is around 2.5A when shorting for single unit. I have just tried connecting them in series and parallel then measure discharge current. ...
4
votes
2answers
220 views

Electrons' flow misconception?

Conductors have a single electron in the last band, these electrons get pushed forward by electrons coming from the source (Battery), each electron pushes its neighbor and so on. Current is the flow ...
20
votes
3answers
9k views

What's the highest theoretical energy density for a chemical battery?

This is more a physics/chemistry/nanotech question, but what's the theoretical best energy density you could get out of a chemical battery (or fuel cell), if you could arrange atoms in any manner you ...